CA2603631A1 - Seal stock laminate - Google Patents

Seal stock laminate Download PDF

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Publication number
CA2603631A1
CA2603631A1 CA002603631A CA2603631A CA2603631A1 CA 2603631 A1 CA2603631 A1 CA 2603631A1 CA 002603631 A CA002603631 A CA 002603631A CA 2603631 A CA2603631 A CA 2603631A CA 2603631 A1 CA2603631 A1 CA 2603631A1
Authority
CA
Canada
Prior art keywords
laminate
layer
tabstock
seal
range
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002603631A
Other languages
French (fr)
Other versions
CA2603631C (en
Inventor
Andrew Fenwick Mclean
David John O'brien
Victor Sachs
Craig Warren Thornhill
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Selig Sealing Products Inc
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2603631A1 publication Critical patent/CA2603631A1/en
Application granted granted Critical
Publication of CA2603631C publication Critical patent/CA2603631C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/29—Laminated material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/16—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
    • B32B37/20—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of continuous webs only
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/09—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284—Application of adhesive
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31786—Of polyester [e.g., alkyd, etc.]
    • Y10T428/31797—Next to addition polymer from unsaturated monomers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31909—Next to second addition polymer from unsaturated monomers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31909—Next to second addition polymer from unsaturated monomers
    • Y10T428/31913—Monoolefin polymer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31909—Next to second addition polymer from unsaturated monomers
    • Y10T428/31928—Ester, halide or nitrile of addition polymer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31935—Ester, halide or nitrile of addition polymer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31938—Polymer of monoethylenically unsaturated hydrocarbon

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Closures For Containers (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

A method for producing a primary laminate including a tabstock by feeding a seal laminate comprising bottom food contact layers including a foil layer and a top polyester layer to a laminating station wherein either the foil layer of the underside of the polyester layer has been printed; simultaneously feeding a tabstock, which is narrower than the seal laminate, to the laminating station such that the bottom of the tabstock and the top polyester layer of the seal laminate come into contact to form a primary substrate, simultaneously feeding a plastic film stock; and continuously extruding a polymeric adhesive between the top face of the primary substrate and bottom surface of the plastic film stock.

Claims (42)

1. ~A method for producing a primary laminate including a tabstock the method comprising the steps of:
a) ~feeding a seal laminate (1) comprising bottom food contact layers (2,3) including a foil layer (4) and a top polyester layer (5) to a laminating station;
b) ~simultaneously feeding a tabstock (6), which is narrower than the seal laminate, to the laminating station (12)such that the bottom of the tabstock and the top polyester layer of the seal laminate come into contact to form a primary substrate (1a), the top face of which is partly comprised of the top face of the tabstock and partly comprised of the top polyester layer of the seal prior to reaching the laminating station;
c) ~simultaneously feeding a plastic film stock (8) which has top and bottom surfaces to the laminating station; and d) ~continuously extruding a polymeric adhesive (7) between the top face of the primary substrate and bottom surface of the plastic film stock such that the two are adhered together with a bond strength greater than 15N/cm when the tabstock is pulled at 90° to the machine direction and at 180°
to the primary substrate, to form a primary laminate including a tabstock.
2. ~The method according to claim 1, wherein either the foil layer or the underside of the polyester layer which form part of the seal laminate have been printed.
3. ~The method according to claim 1, wherein the plastic film stock is formed from a material selected from the group consisting of polyethylene terephthalate, polyamide, polyethylene or a composite of the aforementioned materials.
4. ~The method according to claim 3, wherein the plastic film stock is polyethylene terephthalate.
5. ~The method according to any preceding claim, wherein the top polyester layer of the seal laminate is polyethylene terephthalate.
6. ~The method according to any preceding claim, wherein the polymeric adhesive has a melt flow index in the range from 5 to 25dg/min.
7. ~The method according to claim 1, wherein the tabstock is formed of polyethylene terephthalate.
8. ~The method according to any preceding claim, wherein the tabstock includes a coloured or printed PET layer.
9. ~The method according to any preceding claim, wherein in step (b), the tabstock comprises a plurality of narrow tabstocks arranged at regularly spaced intervals.
10. ~The method according to any preceding claim, wherein the thickness of the top plastic film layer of the heat sealable laminate is in the range from 12 to 36µm.
11. ~The method according to any preceding claim, wherein the thickness of the plastic film stock is in the range from 12 to 36µm
12. ~The method according to any preceding claim, wherein the thickness of the tabstock is in the range from 12 to 25µm.
13. ~The method according to any preceding claim, wherein the polymeric adhesive is ethylene methyl acrylate.
14. ~A method of making a laminate according to claim 1 comprising the further steps of :
a) ~feeding the primary laminate including a tabstock (1 b) to a first laminating station;
b) ~simultaneously feeding a secondary seal stock (17) which has an overall stiffness in the range from 200-1200gcm and has an upper face for contact with a container closure and a lower face for sealing against a container, to the laminating station;
c) ~extruding a second polymeric adhesive through a die head between the top plastic film face of the primary laminate including a tabstock and the lower face of the secondary seal stock to form a seal stock laminate.
15. ~The method according to claim 14, wherein the second polymeric adhesive has a melt flow index in the range from 5 to 25dg/min
16. ~The method according to claim 14, wherein the second polymeric adhesive is polyethylene.
17. ~The method according to claim 14, wherein in step c) the second polymeric adhesive comprises two polymeric adhesives which are coextruded.
18. ~The method according to claim 17, wherein the two polymeric adhesives are polyethylene and polypropylene.
19. ~The method according to any preceding claim, wherein the length of the die head is in the range from 500 to 2000mm
20. ~The method according to claim 19, wherein the gap of the die head is in the range from 500 to 700µm.
21. ~The method according to claim 14, wherein the secondary seal stock is pulpboard or kraftboard.
22. ~The method according to claim 21, wherein the thickness of the pulpboard or kraftboard is in the range from 500 to 1000µm.
23. ~The method according to claim 14, wherein the secondary seal stock is a synthetic laminate.
24. ~The method according to claim 23, wherein the synthetic laminate comprises a foam with a facing layer on each face thereof.
25. ~The method according to claim 24, wherein the foam is polyethylene or polypropylene foam.
26. ~The method according to claim 24 or 25, wherein the foam layer has a thickness in the range from 0.85 to 1.65mm.
27. ~The method according to either claim 24 or 25, wherein the facing layers have a thickness in the range from 20 to 70 µm.
28. ~The method according to claim 17, wherein the facing layer comprises a homopolymer centre with a copolymer on each face thereof.
29. ~The method according to claim 28, wherein the homopolymer is polypropylene and the copolymer is a polypropylene/polyethylene copolymer.
30. ~The method according to claim 28, wherein the second polymeric adhesive comprises coextruded polypropylene and polyethylene such that the polypropylene is in contact with the lower face of the secondary seal stock and the polyethylene is in contact with the top polyester face of the primary laminate.
31. ~The method according to any preceding claim, wherein the metal foil has a thickness in the range from 12 to 30µm.
32. ~The method according to claim 31 wherein the metal foil is aluminium.
33. ~The method according to any preceding claim, wherein the bottom layers (2,3) of the seal laminate (1) are induction heat sealable layers.
34. ~The method according to any of claims 1 to 32, wherein bottom layer (2) of the seal laminate (1) is formed from glassine and layer (3) is an adhesive layer.
35. ~The method according to claim 34, wherein the adhesive layer consists of a water based adhesive or a polyethylene-based adhesive.
36. ~The method according to any of claims 1 to 32, wherein the bottom layers (2,3) of the seal laminate are conduction heat sealable layers.
37. ~A primary laminate comprising:
a seal laminate (1) comprising bottom food contact layers (2,3) including a foil layer (4) and a top polyethylene terephthalate layer (5);
a tabstock (6) which has a top and bottom face wherein the bottom face is in contact with the top polyethylene terepthalate layer (5); and a layer of plastic film (8) adhered to the top face of the tabstock (6) by an extruded polymeric adhesive (7).
38. ~A laminate comprising:
the primary laminate according to claim 37 adhered to a secondary seal stock which has an overall stiffness in the range from 200-1200gcm wherein the top plastic film layer (8) of the primary laminate is adhered to the secondary seal stock by an extruded polymeric adhesive.
39. ~A method which comprises taking the primary laminate of claim 37 or laminate of claim 38 and cutting it into strips.
40. ~The method according to claim 39, wherein the strips are then shaped to form vessel closing assembly.
41. ~A screw cap which has retained within it the shaped vessel closing assembly according to claim 40.
42. ~A container which is fitted with a cap according to claim 41 wherein the seal laminate is sealed to the mouth of the container to enclose a liquid or solid substance.
CA2603631A 2005-04-15 2006-04-12 Seal stock laminate Expired - Fee Related CA2603631C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP05252384 2005-04-15
EP05252384.2 2005-04-15
PCT/EP2006/061548 WO2006108853A1 (en) 2005-04-15 2006-04-12 Seal stock laminate

Publications (2)

Publication Number Publication Date
CA2603631A1 true CA2603631A1 (en) 2006-10-19
CA2603631C CA2603631C (en) 2012-06-05

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CA2603631A Expired - Fee Related CA2603631C (en) 2005-04-15 2006-04-12 Seal stock laminate

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EP (1) EP1789260B1 (en)
JP (1) JP2008535703A (en)
KR (1) KR101295219B1 (en)
CN (1) CN101160211B (en)
AT (1) ATE415273T1 (en)
AU (1) AU2006234311B2 (en)
BR (1) BRPI0610582A2 (en)
CA (1) CA2603631C (en)
DE (1) DE602006003838D1 (en)
ES (1) ES2318743T3 (en)
MX (1) MX2007012737A (en)
NZ (1) NZ563099A (en)
WO (1) WO2006108853A1 (en)

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KR101295219B1 (en) 2013-08-12
BRPI0610582A2 (en) 2010-07-06

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